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Subject: Re: [PATCH v2 09/12] remoteproc: stm32: Update M4 state in
 stm32_rproc_stop()
To:     Mathieu Poirier <mathieu.poirier@linaro.org>,
        <bjorn.andersson@linaro.org>, <ohad@wizery.com>,
        <mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
CC:     <loic.pallardy@st.com>, <linux-remoteproc@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
References: <20200424202505.29562-1-mathieu.poirier@linaro.org>
 <20200424202505.29562-10-mathieu.poirier@linaro.org>
From:   Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Message-ID: <f4394e9d-2915-2e15-38e4-80b23baf678e@st.com>
Date:   Wed, 29 Apr 2020 16:52:17 +0200
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On 4/24/20 10:25 PM, Mathieu Poirier wrote:
> Update the M4 co-processor state in function stm32_rproc_stop() so
> that it can be used in synchronisation scenarios.
> 
> Mainly based on the work published by Arnaud Pouliquen [1].
> 
> [1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

Thanks,
Arnaud

> ---
>  drivers/remoteproc/stm32_rproc.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index 404f17a97095..86d23c35d805 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -493,6 +493,18 @@ static int stm32_rproc_stop(struct rproc *rproc)
>  		}
>  	}
>  
> +	/* update coprocessor state to OFF if available */
> +	if (ddata->m4_state.map) {
> +		err = regmap_update_bits(ddata->m4_state.map,
> +					 ddata->m4_state.reg,
> +					 ddata->m4_state.mask,
> +					 M4_STATE_OFF);
> +		if (err) {
> +			dev_err(&rproc->dev, "failed to set copro state\n");
> +			return err;
> +		}
> +	}
> +
>  	return 0;
>  }
>  
> @@ -531,6 +543,7 @@ static struct rproc_ops st_rproc_ops = {
>  
>  static __maybe_unused struct rproc_ops st_rproc_sync_ops = {
>  	.start		= stm32_rproc_sync_start,
> +	.stop		= stm32_rproc_stop,
>  };
>  
>  static const struct of_device_id stm32_rproc_match[] = {
>